This is way too broad a question to answer in this forum. Every case of this nature is fact specific, and the situations in which the court has analyzed the issue of "involuntary" confessions are voluminous. This is a heavily litigated area of the law, which changes constantly. You should take your specific case or situation to a qualified criminal defense attorney to have it thoroughly reviewed. If this is just for some research project or homework assignment this is not the place for that.
You mention some factual parameters that are used in a legal analysis of the totality of circumstances to determine whether a custodial of involuntary interrogation may lead to an affirmative defense in any given Motion to suppress evidence.
Like in any trade, it is fine art as each good attorney painstakingly analyses all facts and relevant case law to advance such legal premise in court.
To do it on Avvo is absolutely impossible. Like suggesting to fix the car brakes by phone for a car that requires new brake pads, not suggestions.
Retain an experienced criminal counsel in California to facilitate these objectives in court.
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Many of these issues do not typically apply in a DUI case, particularly if there was an accident. I suggest that you consult with a locally experienced DUI attorney to have the applicable issues in your case analyzed. Best of luck.
You asked many complex questions on your DUI. An experienced DUI attorney is required to answer some of your questions, especially on issues surrounding injuries and a traffic collision.